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7.7 GeV Low Energy Program

7.7 GeV Low Energy Program. Into the *real* home stretch of the 7.7 GeV run still 10 minute stores :) Turnaround times about 2 minutes to second beam Still in physics 80%+ of wall clock time Operations have continued to excel at turnaround

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7.7 GeV Low Energy Program

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  1. 7.7 GeV Low Energy Program • Into the *real* home stretch of the 7.7 GeV run • still 10 minute stores :) • Turnaround times about 2 minutes to second beam • Still in physics 80%+ of wall clock time • Operations have continued to excel at turnaround • Gap cleaning still running, BLM allowed to pull permit • with beam position at STAR at -8 mm no more regular orbit corrections • yellow beam intensity pretty constant, blue dropped over the weekend and didn't recover yet :( • PHENIX collision rate constant, not much background (BBC LL1) • STAR VPD rate varies

  2. blue intensity last week APEX AGS chiller, LLRF STAR magnet trip 45 e9 maintenance we are fighting low blue injection intensity we keep trying ...

  3. yellow beam intensity last week 65e9 maintenance

  4. STAR vertical orbit moved • being so far off-center makes it very sensitive to even small changes in the orbit (aka orbit corrections)

  5. STAR backgrounds .... hysteresis .... permanent work in progress !

  6. STAR Luminosity ... work in progress too

  7. Summary since May 12th beam intensity vs. date Lumi vs. date

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